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20y -100
2b. (x +5) (5x -1)
x² -x +25x -5
x² +24x -5
2c. (7 -2x) (2x -7)
14x -49 -4x² +14x
14x +14x -4x² -49
28x -4x² -49
3. (2x +3y) (px +qy) = rx² +23xy +12y²
2px +2qxy +3pxy +3qy² = rx² +23xy +12y²
r = 2p
2q +3p = 23
3q = 12
> q = 4
> 2q +3p = 23
2 (4) +3p = 23
8 +3p = 23
3p = 15
p = 5
> r = 2p
r = 2 (5)
r = 10
Jadi, nilai r pada persamaan bentuk Aljabar tersebut adalah 10